Never heard of doing that for a central air compressor. Freon, the coolant, doesn't freeze, and there is no water in the compressor. I wouldn't bother.

But if you have a washing machine, you should put anti-freeze in there. You want a specific kind, I think for boats. Run a "load" with just water and pour the correct amount of AF in with the load. That will get the anti-freeze into the well of water that doesn't get expunged from the machine. Disconnect the pipes and power and drain the pipes into a bucket.

Hi Klem1,

Where is the evaporator drain located?

There is a white pvc pipe on the unit in the crawl space in the attic.

There is also a drain pan under the unit, but it's drain pipe is capped off.

Thanks

"There is a white pvc pipe on the unit in the crawl space in the attic."

That's it.

I would extend the pan line to exit soffit above window in kitchen or through ceiling above shower or tub. The pan catches condensate before it wet's ceiling in the event primary drain clogs. The idea of terminating pan drain line in a conspicous place is so you get early warning.

Pouring something into the unit sounds quite risky, I've never heard anyone doing this to prevent freezing. Turning on the air conditioner for some days during the winter period would work. Might also prevent other pipes from freezing...

I know this is old. But you SHOULD put anti-freeze in the central AC line. We had a problem once and the AC guy told us to do this and we haven't had a problem since.

Lori'z Rhythm didn't clarify in her post that the anti-freeze of mention goes into the central AC condensate drain line (in preparation for freezing weather), not into the refrigerant/Freon lines ... but I have no doubt that is what she intended to convey ... the same as Klem1 had stated previously in the discussion.